Rick Thornquist
Member
Hi Folks! Hope you can help with a very weird problem...
I picked up a used Apple IIGS. When I tried booting the thing, the drive would click a few times, and then I'd get the "Check startup device!" screen. Not good, but the weird thing is that after that, the disk is unreadable. I try reading it on another machine and I get "I/O Error". I reformat the disk on another machine, copy ProDOS onto it, and try booting it again on the IIGS. Same thing, after booting it's unreadable. I tried booting other disks that boot fine on other machines. Same thing, it doesn't boot and the disk becomes unreadable.
The IIGS is ROM Version 01 with no cards. The drive is an Apple 5.25 Drive (A9M0107). I'm using a Commodore 1702 composite monitor, an Apple Keyboard II (M0487), and an Apple Mouse (A9M0331). In the control panel, everything is set to the defaults.
I have another, working, IIGS and have tried swapping the power supplies, no difference. I tried swapping drives, no difference. I even tried swapping the keyboard and mouse, no difference. I checked the voltages, they are fine. I checked the battery voltage, it's fine. I did a self-test, no problem. I even tried the power supply and drive from the problem IIGS on my other other IIGS, they work fine. The disk boots and is fine afterwards.
At this point, I'm baffled. Obviously the booting problem is an issue with the motherboard but I have no idea what it is. And why is it making the boot disk unreadable? Any help on this would be greatly appreciated!
- Rick
I picked up a used Apple IIGS. When I tried booting the thing, the drive would click a few times, and then I'd get the "Check startup device!" screen. Not good, but the weird thing is that after that, the disk is unreadable. I try reading it on another machine and I get "I/O Error". I reformat the disk on another machine, copy ProDOS onto it, and try booting it again on the IIGS. Same thing, after booting it's unreadable. I tried booting other disks that boot fine on other machines. Same thing, it doesn't boot and the disk becomes unreadable.
The IIGS is ROM Version 01 with no cards. The drive is an Apple 5.25 Drive (A9M0107). I'm using a Commodore 1702 composite monitor, an Apple Keyboard II (M0487), and an Apple Mouse (A9M0331). In the control panel, everything is set to the defaults.
I have another, working, IIGS and have tried swapping the power supplies, no difference. I tried swapping drives, no difference. I even tried swapping the keyboard and mouse, no difference. I checked the voltages, they are fine. I checked the battery voltage, it's fine. I did a self-test, no problem. I even tried the power supply and drive from the problem IIGS on my other other IIGS, they work fine. The disk boots and is fine afterwards.
At this point, I'm baffled. Obviously the booting problem is an issue with the motherboard but I have no idea what it is. And why is it making the boot disk unreadable? Any help on this would be greatly appreciated!
- Rick